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    <h1 class="post_title">Exynos4412启动介绍</h1>
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      2020/03/05</span>
    <span class="post_time"> | 2 分钟阅读</span><span>&nbsp;|<a href='https://kingdix10.gitee.io/tags/4412/' title="4412" class="post_tag button button_translucent">4412
        </a><a href='https://kingdix10.gitee.io/tags/%E5%90%AF%E5%8A%A8%E6%B5%81%E7%A8%8B/' title="启动流程" class="post_tag button button_translucent">启动流程
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      <div class="post_toc">
        <h2>文章目录</h2>
        <nav id="TableOfContents">
  <ul>
    <li><a href="#1-两种大小的bl1是怎么回事">1. 两种大小的BL1是怎么回事</a></li>
    <li><a href="#2-exynos4412的启动流程">2. Exynos4412的启动流程</a></li>
    <li><a href="#3-函数介绍">3. 函数介绍</a>
      <ul>
        <li>
          <ul>
            <li><a href="#31-sdmmc_readblocks">3.1. SDMMC_ReadBlocks</a></li>
            <li><a href="#32-loadbl2fromemmc43ch0">3.2. LoadBL2FromEmmc43Ch0</a></li>
            <li><a href="#33-msh_readfromfifo_emmc">3.3. MSH_ReadFromFIFO_eMMC</a></li>
            <li><a href="#34-msh_endbootop_emmc">3.4. MSH_EndBootOp_eMMC</a></li>
            <li><a href="#35-loadimagefromusb">3.5. LoadImageFromUsb</a></li>
          </ul>
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      </ul>
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    <div class="post_body"><h1 id="1-两种大小的bl1是怎么回事">1. 两种大小的BL1是怎么回事</h1>
<p>关于4412的BL1，有说8k的，也有说15k的，到底哪一个是对的呢？</p>
<p>这要追溯一下4412的版本，Exynos4412一共有两个版本，一个是Exynos 4412，另一个是Exynos 4412 Prime。网上大多数文章都是基于8k来介绍BL1的。我只在<a href="https://chasinglulu.github.io/2019/05/28/%E5%85%B3%E4%BA%8EExynos4412-SoC%E7%9A%84%E5%90%AF%E5%8A%A8%E5%88%86%E6%9E%90/">关于Exynos4412 SoC的启动分析 | 点滴汇聚 (chasinglulu.github.io)</a>和<a href="https://blog.csdn.net/u012867916/article/details/119619545">Exynos4412 的启动过程详解（四）</a>看到过关于Exynos 4412 Prime的介绍，但是没到找到对应的官方资料。两者的主要差异就在于BL1的大小。Exynos 4412 Prime可以支持15k的BL1，也向后兼容，支持8k的BL1。</p>
<table>
<thead>
<tr>
<th>desc</th>
<th>8k</th>
<th>size</th>
<th>15k</th>
<th>size</th>
</tr>
</thead>
<tbody>
<tr>
<td>ProductID, iROM version, function pointer</td>
<td>0x0202_0000</td>
<td></td>
<td>0x0202_0000</td>
<td></td>
</tr>
<tr>
<td>iROM stack</td>
<td>0x0202_0100</td>
<td>1.75K</td>
<td>0x0202_0100</td>
<td>1.75K</td>
</tr>
<tr>
<td>iROM ZI/RW</td>
<td>0x0202_0800</td>
<td>3KiB</td>
<td>0x0202_0800</td>
<td>3K</td>
</tr>
<tr>
<td>BL1</td>
<td>0x0202_1400</td>
<td>8K</td>
<td>0x0202_1400</td>
<td>15K</td>
</tr>
<tr>
<td>BL2+padding</td>
<td>0x0202_3400</td>
<td>16K</td>
<td>0x0202_5000</td>
<td>16K</td>
</tr>
<tr>
<td>free space</td>
<td>0x0202_7400</td>
<td></td>
<td>0x0202_9000</td>
<td></td>
</tr>
<tr>
<td>END</td>
<td>0x0206_0000</td>
<td></td>
<td>0x0206_0000</td>
<td></td>
</tr>
</tbody>
</table>
<p><figure>
  <picture>

    
      
        
        
        
        
        
        
    <img
      loading="lazy"
      decoding="async"
      alt="1685873254889"
      
        class="image_figure image_internal image_unprocessed"
        src="1685873254889.png"
      
      
    />

    </picture>
</figure>
</p>
<p><figure>
  <picture>

    
      
        
        
        
        
        
        
    <img
      loading="lazy"
      decoding="async"
      alt="1685873213003"
      
        class="image_figure image_internal image_unprocessed"
        src="1685873213003.png"
      
      
    />

    </picture>
</figure>

1.1. 维基百科给出的介绍</p>
<p>这里摘抄一下维基百科介绍：</p>
<p>2011年推出的Exynos 4210才是Exynos系列的第一款产品，它之前被人熟知的名字是Orion（猎户座）。Exynos 4210采用45nm制程，拥有两枚主频为1.2 GHz的Cortex-A9通用处理核心，拥有32/32 KB I/D Cache, 1 MB L2 Cache，并且集成ARM Mali-400 MP图形处理核心。在视频方面，Exynos 4210支持单路WXGA和双路WSVGA视频输出，支持HDMI v1.3a高清标准，可以拍摄1080p、30fps标准高清视频；Exynos 4210提供了6.4GB/s的内存带宽，支持LPDDR2/DDR2/DDR3内存。代表产品有<a href="https://zh.wikipedia.org/wiki/%E4%B8%89%E6%98%9FGalaxy_Tab_7.7" title="三星Galaxy Tab 7.7">三星Galaxy Tab 7.7</a>、Galaxy S II（i9100）、<a href="https://zh.wikipedia.org/wiki/Galaxy_Note" title="Galaxy Note">Galaxy Note</a>和<a href="https://zh.wikipedia.org/wiki/%E9%AD%85%E6%97%8FMX" title="魅族MX">魅族MX</a>等。
2011年9月发布的Exynos 4212在Exynos 4210的基础上再加改进：首先制程变为32nm，比起之前的45nm能够节省超过50%的能源。而且虽然同样为Cortex-A9架构，但Exynos 4212主频升至1.5GHz，比起4210更为强劲，3D性能约为后者的2倍，可用在<a href="https://zh.wikipedia.org/wiki/%E6%89%8B%E6%9C%BA" title="手机">手机</a>及<a href="https://zh.wikipedia.org/wiki/%E5%B9%B3%E6%9D%BF%E9%9B%BB%E8%85%A6" title="平板电脑">平板电脑</a>上。
2012年初，<a href="https://zh.wikipedia.org/wiki/%E4%B8%89%E6%98%9F%E9%9B%BB%E5%AD%90" title="三星电子">三星</a>正式推出了自家的首款<a href="https://zh.wikipedia.org/w/index.php?title=%E5%9B%9B%E6%A0%B8%E7%A7%BB%E5%8A%A8%E5%A4%84%E7%90%86%E5%99%A8&amp;action=edit&amp;redlink=1" title="四核移动处理器（页面不存在）">四核移动处理器</a>Exynos 4412。这款新Exynos四核<a href="https://zh.wikipedia.org/wiki/%E5%A4%84%E7%90%86%E5%99%A8" title="处理器">处理器</a>，拥有32nm HKMG（高K金属栅极技术）制程，支持双通道LPDDR2 1066。新的32nm HKMG技术可以帮助降低<a href="https://zh.wikipedia.org/w/index.php?title=%E5%8A%9F%E8%80%97&amp;action=edit&amp;redlink=1" title="功耗（页面不存在）">功耗</a>，按照官方的说法，和其前代比会减低20% 的功耗。三星Exynos 4412四核处理器仍然集成Mali-400MP<a href="https://zh.wikipedia.org/wiki/%E5%9C%96%E5%BD%A2%E8%99%95%E7%90%86%E5%99%A8" title="图形处理器">图形处理器</a>，但<a href="https://zh.wikipedia.org/wiki/%E4%B8%89%E6%98%9F%E5%85%AC%E5%8F%B8" title="三星公司">三星公司</a>已将这颗图形处理器主频由此前的266MHz提升至400MHz，新闻稿指出会比现有的双核机型整体性能提升60%，图像处理提升 50%。2012年5月，首款采用Exynos 4412处理器的智能手机<a href="https://zh.wikipedia.org/wiki/%E4%B8%89%E6%98%9FGalaxy_S_III" title="三星Galaxy S III">三星Galaxy S III</a>正式上市，以及于6月上市的魅族MX四核版和12月上市的纽曼N2。</p>
<table>
<thead>
<tr>
<th>SoC</th>
<th>CPU</th>
<th>GPU</th>
<th>内存技术</th>
<th>供货时间</th>
<th>应用设备</th>
</tr>
</thead>
<tbody>
<tr>
<td>型号</td>
<td><a href="https://zh.wikipedia.org/wiki/%E8%A3%BD%E7%A8%8B" title="制程">制程</a></td>
<td><a href="https://zh.wikipedia.org/wiki/%E6%8C%87%E4%BB%A4%E9%9B%86" title="指令集">指令集</a></td>
<td>架构</td>
<td>核心</td>
<td>频率 (<a href="https://zh.wikipedia.org/wiki/GHz" title="GHz">GHz</a>)</td>
</tr>
<tr>
<td>Exynos 4 Dual 45 nm``<em>(Exynos 4210)</em> ^<a href="https://zh.wikipedia.org/zh-cn/%E4%B8%89%E6%98%9FExynos#cite_note-4212page-7">[7]</a>^</td>
<td>45 nm</td>
<td><a href="https://zh.wikipedia.org/wiki/ARMv7" title="ARMv7">ARMv7</a></td>
<td><a href="https://zh.wikipedia.org/w/index.php?title=ARM_Cortex-A9_MPCore&amp;action=edit&amp;redlink=1" title="ARM Cortex-A9 MPCore（页面不存在）">Cortex-A9</a></td>
<td>2</td>
<td>1.2 <code>或</code>1.4</td>
</tr>
<tr>
<td>Exynos 4 Dual 32 nm``<em>(Exynos 4212)</em> ^<a href="https://zh.wikipedia.org/zh-cn/%E4%B8%89%E6%98%9FExynos#cite_note-4212page-7">[7]</a>^</td>
<td><a href="https://zh.wikipedia.org/w/index.php?title=32_nanometer&amp;action=edit&amp;redlink=1" title="32 nanometer（页面不存在）">32 nm</a> <a href="https://zh.wikipedia.org/w/index.php?title=High-k_dielectric&amp;action=edit&amp;redlink=1" title="High-k dielectric（页面不存在）">HKMG</a></td>
<td><a href="https://zh.wikipedia.org/w/index.php?title=ARM_Cortex-A9_MPCore&amp;action=edit&amp;redlink=1" title="ARM Cortex-A9 MPCore（页面不存在）">Cortex-A9</a></td>
<td>2</td>
<td>1.5</td>
<td>Mali-400MP4^<a href="https://zh.wikipedia.org/zh-cn/%E4%B8%89%E6%98%9FExynos#cite_note-10">[10]</a>^ (quad-core) @ 400 MHz; 16 GFLOPS</td>
</tr>
<tr>
<td>Exynos 4 Quad^<a href="https://zh.wikipedia.org/zh-cn/%E4%B8%89%E6%98%9FExynos#cite_note-SE4Quad-13">[13]</a>^`` <em>(Exynos 4412)</em> ^<a href="https://zh.wikipedia.org/zh-cn/%E4%B8%89%E6%98%9FExynos#cite_note-SGSIII-14">[14]</a>^</td>
<td>32 nm HKMG</td>
<td><a href="https://zh.wikipedia.org/w/index.php?title=ARM_Cortex-A9_MPCore&amp;action=edit&amp;redlink=1" title="ARM Cortex-A9 MPCore（页面不存在）">Cortex-A9</a></td>
<td>4</td>
<td>1.4</td>
<td>ARM Mali-400MP4^<a href="https://zh.wikipedia.org/zh-cn/%E4%B8%89%E6%98%9FExynos#cite_note-4412Manual-15">[15]</a>^ (quad-core) @ 440 MHz ; 17.6 GFLOPS</td>
</tr>
<tr>
<td>Exynos 4 Quad^<a href="https://zh.wikipedia.org/zh-cn/%E4%B8%89%E6%98%9FExynos#cite_note-SE4Quad-13">[13]</a>^`` <em>(Exynos 4412 Prime)</em> ^<a href="https://zh.wikipedia.org/zh-cn/%E4%B8%89%E6%98%9FExynos#cite_note-SGSIII-14">[14]</a>^</td>
<td>32 nm HKMG</td>
<td><a href="https://zh.wikipedia.org/w/index.php?title=ARM_Cortex-A9_MPCore&amp;action=edit&amp;redlink=1" title="ARM Cortex-A9 MPCore（页面不存在）">Cortex-A9</a></td>
<td>4</td>
<td>1.6</td>
<td>ARM Mali-400MP4^<a href="https://zh.wikipedia.org/zh-cn/%E4%B8%89%E6%98%9FExynos#cite_note-4412Manual-15">[15]</a>^ (quad-core) @ 533 MHz; 21.32 GFLOPS</td>
</tr>
</tbody>
</table>
<h1 id="2-exynos4412的启动流程">2. Exynos4412的启动流程</h1>
<p>关于Exynos4412的启动模式、启动流程、文件布局等，在Android_Exynos4412_iROM_Secure_Booting_Guide_Ver.1.00.00.pdf介绍的很清楚。</p>
<p>关于文件布局，Exynos 4412对BL1进行了限定，如果是使用官方的BL1，则BL2也需要满足指定的要求。如果是自制的BL1，只需要关心BL1的限定即可，BL2可以根据自制的BL1来进行布局。官方给出的布局是BL1+BL1+u-boot+tzsw。</p>
<p>BL1和BL2在存储介质中的block小结。</p>
<table>
<thead>
<tr>
<th></th>
<th>SD(8k)</th>
<th>eMMC(8k)</th>
<th>SD(15k)</th>
<th>eMMC(15k)</th>
</tr>
</thead>
<tbody>
<tr>
<td>BL1</td>
<td>1~16</td>
<td>0~15</td>
<td>1~30</td>
<td>0~29</td>
</tr>
<tr>
<td>BL2</td>
<td>17~48</td>
<td>16~47</td>
<td>31~62</td>
<td>30~61</td>
</tr>
</tbody>
</table>
<h1 id="3-函数介绍">3. 函数介绍</h1>
<p>三星提供了一组从外部介质加载数据的函数，可以在BL1或BL2中直接使用，相关介绍在Android_Exynos4412_iROM_Secure_Booting_Guide_Ver.1.00.00.pdf。</p>
<p>看一下文档中提到的注意事项：</p>
<ol>
<li>在启动时提供给SDMMC和eMMC的时钟是20Mhz，MPLL是这些时钟的源头。</li>
<li>如果SDMMC和eMMC被选中为启动设备，那么iROM中SDMMC或eMMC拷贝函数在BL1和BL2阶段是可以使用的。如果你要使用这两函数，那么在使用前请不要修改SDMMC或eMMC的时钟。</li>
</ol>
<p>另外不要修改SDMMC或eMMC相关的PLL时钟配置。如果你修改了SDMMC或eMMC相关的时钟配置，那么正确的拷贝我们无法保证。</p>
<table>
<thead>
<tr>
<th>addr</th>
<th>name</th>
</tr>
</thead>
<tbody>
<tr>
<td>0x02020030</td>
<td>SDMMC_ReadBlocks</td>
</tr>
<tr>
<td>0x0202003C</td>
<td>LoadBL2FromEmmc43Ch0</td>
</tr>
<tr>
<td>0x02020044</td>
<td>MSH_ReadFromFIFO_eMMC</td>
</tr>
<tr>
<td>0x02020048</td>
<td>MSH_EndBootOp_eMMC</td>
</tr>
<tr>
<td>0x02020070</td>
<td>LoadImageFromUsb</td>
</tr>
</tbody>
</table>
<p>这里特别说明一下MSH_ReadFromFIFO_eMMC和MSH_EndBootOp_eMMC。</p>
<p><strong>MSH_EndBootOp_eMMC是从eMMC中复制数据到指定位置，这个函数首先从eMMC偏移为0的位置读取，再次调用时，会以上一次读取的结尾为偏移再进行读取。</strong></p>
<p>MSH_EndBootOp_eMMC是所有读取动作完成后调用的。Exynos4412要求启动时从eMMC的boot分区读取数据，个人猜测这个函数是用来将eMMC的读写分区切换到userdata的。如果要烧录boot分区，可以用U-Boot的 <code>mmc partconf</code>命令来切换要读写的物理分区或设置eMMC上电后的默认读写分区。</p>
<p>如设置为boot0分区启动：</p>
<div class="highlight"><pre tabindex="0" class="chroma"><code class="language-shell" data-lang="shell"><span class="line"><span class="ln">1</span><span class="cl">mmc partconf <span class="m">0</span> <span class="m">1</span> <span class="m">1</span> <span class="m">1</span>
</span></span></code></pre></div><h3 id="31-sdmmc_readblocks">3.1. SDMMC_ReadBlocks</h3>
<p>这个接口功能是从SD或MMC类型设备拷贝数据到目的地址中；</p>
<p>返回1=True，0=False；参数(u32 SrcBlock，u32 NumofSrcBlock，void * DstByte)</p>
<p>SrcBlock：start block number.(0 ~ n)拷贝起始块的编号从0开始</p>
<p>NumofSrcBlock：拷贝块的数目</p>
<p>DstByte：目的地址(System Memory)</p>
<h3 id="32-loadbl2fromemmc43ch0">3.2. LoadBL2FromEmmc43Ch0</h3>
<p>这个接口从emmc 4.3拷贝BL2启动区数据到内部RAM；</p>
<p>返回1=True，0=False；参数(u32 SrcBlock，u32 * DstByte )</p>
<p>0x02020040 Emmc43_EndBootOp_eMMC
这个接口结束emmc 4.3启动模式；</p>
<p>返回和参数都是void</p>
<h3 id="33-msh_readfromfifo_emmc">3.3. MSH_ReadFromFIFO_eMMC</h3>
<p>这个接口从emmc 4.4拷贝启动区数据到目的地址；</p>
<p>返回1=True，0=False；参数(u32 uNumofBlocks，void * uDstAddr)</p>
<p>uNumofBlocks：传输的总块数，1块=512B</p>
<p>uDstAddr：目的地址(System Memory)</p>
<h3 id="34-msh_endbootop_emmc">3.4. MSH_EndBootOp_eMMC</h3>
<p>这个接口结束emmc 4.4启动模式；</p>
<p>返回和参数都是void，这个函数会等待上面读函数的结束。</p>
<h3 id="35-loadimagefromusb">3.5. LoadImageFromUsb</h3>
<p>这个接口从USB拷贝数据，如果在iROM中枚举成功，这个功能就能用；</p>
<p>返回1=True，0=False；参数void</p>

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